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[Footnote 1: Written in 1899. (_Encyclopoedia_Britannica_.)]

Sea-power is a term used to indicate two distinct, though cognate things. The affinity of these two and the indiscriminate manner in which the term has been applied to each have tended to obscure its real significance. The obscurity has been deepened by the frequency with which the term has been confounded with the old phrase, 'Sovereignty of the sea,' and the still current expression, 'Command of the sea.' A discussion—etymological, or even archæological in character—of the term must be undertaken as an introduction to the explanation of its now generally accepted meaning. It is one of those compound words in which a Teutonic and a Latin (or Romance) element are combined, and which are easily formed and become widely current when the sea is concerned. Of such are 'sea-coast,' 'sea-forces' (the 'land- and sea-forces' used to be a common designation of what we now call the 'Army and Navy'), 'sea-service,' 'sea-serpent,' and 'sea-officer' (now superseded by 'naval officer'). The term in one form is as old as the fifteenth century. Edward III, in commemoration of the naval victory of Sluys, coined gold 'nobles' which bore on one side his effigy 'crowned, standing in a large ship, holding in one hand a sword and in the other a shield.' An anonymous poet, who wrote in the reign of Henry VI, says of this coin:

For four things our noble showeth to me,

King, ship, and sword, and _power_of_the_sea_.

Even in its present form the term is not of very recent date. Grote [2] speaks of 'the conversion of Athens from a land-power into a sea-power.' In a lecture published in 1883, but probably delivered earlier, the late Sir J. R. Seeley says that 'commerce was swept out of the Mediterranean by the besom of the Turkish sea-power.'[3] The term also occurs in vol. xviii. of the 'Encyclopædia Britannica,' published in 1885. At p. 574 of that volume (art. Persia) we are told that Themistocles was 'the founder of the Attic sea-power.' The sense in which the term is used differs in these extracts. In the first it means what we generally call a 'naval power'—that is to say, a state having a considerable navy in contradistinction to a 'military power,' a state with a considerable army but only a relatively small navy. In the last two extracts it means all the elements of the naval strength of the state referred to; and this is the meaning that is now generally, and is likely to be exclusively, attached to the term owing to the brilliant way in which it has been elucidated by Captain A. T. Mahan of the United States Navy in a series of remarkable works.[4] The double use of the term is common in German, though in that language both parts of the compound now in use are Teutonic. One instance out of many may be cited from the historian Adolf Holm.[5] He says[6] that Athens, being in possession of a good naval port, could become '_eine_bedeutende_ Seemacht,' i.e. an important naval power. He also says[7] that Gelon of Syracuse, besides a large army (Heer), had 'eine _bedeutende_Seemacht_,' meaning a considerable navy. The term, in the first of the two senses, is old in German, as appears from the following, extracted from Zedler's 'Grosses Universal Lexicon,' vol. xxxvi:[8] 'Seemachten, Seepotenzen, Latin. summae _potestates_mari_potentes_.' 'Seepotenzen' is probably quite obsolete now. It is interesting as showing that German no more abhors Teuto-Latin or Teuto-Romance compounds than English. We may note, as a proof of the indeterminate meaning of the expression until his own epoch-making works had appeared, that Mahan himself in his earliest book used it in both senses. He says,[9] 'The Spanish Netherlands ceased to be a sea-power.' He alludes[10] to the development of a nation as a 'sea-power,' and[11] to the inferiority of the Confederate States 'as a sea-power.' Also,[12] he remarks of the war of the Spanish Succession that 'before it England was one of the sea-powers, after it she was the sea-power without any second.' In all these passages, as appears from the use of the indefinite article, what is meant is a naval power, or a state in possession of a strong navy. The other meaning of the term forms the general subject of his writings above enumerated. In his earlier works Mahan writes 'sea power' as two words; but in a published letter of the 19th February 1897, he joins them with a hyphen, and defends this formation of the term and the sense in which he uses it. We may regard him as the virtual inventor of the term in its more diffused meaning, for—even if it had been employed by earlier writers in that sense—it is he beyond all question who has given it general currency. He has made it impossible for anyone to treat of sea-power without frequent reference to his writings and conclusions.

[Footnote 2: _Hist._of_Greece_, v. p. 67, published in 1849, but with preface dated 1848.]

[Footnote 3: _Expansion_of_England_, p. 89.]

[Footnote 4: _Influence_of_Sea-power_on_History_, published 1890; _Influence_of_Sea-power_on_the_French_Revolution_and_Empire_, 2 vols. 1892; _Nelson:_the_Embodiment_of_the_Sea-power_of_Great_ Britain, 2 vols. 1897.]

[Footnote 5: _Griechische_Geschichte_. Berlin, 1889.]

[Footnote 6: Ibid. ii. p. 37.]

[Footnote 7: Ibid. ii. p. 91.]

[Footnote 8: Leipzig und Halle, 1743.]

[Footnote 9: _Influence_of_Sea-power_on_History_, p. 35.]

[Footnote 10: Ibid. p. 42.]

[Footnote 11: Ibid. p. 43.]

[Footnote 12: Ibid. p. 225.]

There is something more than mere literary interest in the fact that the term in another language was used more than two thousand years ago. Before Mahan no historian—not even one of those who specially devoted themselves to the narration of naval occurrences—had evinced a more correct appreciation of the general principles of naval warfare than Thucydides. He alludes several times to the importance of getting command of the sea. This country would have been saved some disasters and been less often in peril had British writers—taken as guides by the public—possessed the same grasp of the true principles of defence as Thucydides exhibited. One passage in his history is worth quoting. Brief as it is, it shows that on the subject of sea-power he was a predecessor of Mahan. In a speech in favour of prosecuting the war, which he puts into the mouth of Pericles, these words occur:—_oi_meu_ _gar_ouch_exousiu_allaeu_autilabeiu_amachei_aemiu_de_esti_ _gae_pollae_kai_eu_uaesois_kai_kat_aepeirou_mega_gar_ _to_tes_thalassaes_kratos_. The last part of this extract, though often translated 'command of the sea,' or 'dominion of the sea,' really has the wider meaning of sea-power, the 'power of the sea' of the old English poet above quoted. This wider meaning should be attached to certain passages in Herodotus,[13] which have been generally interpreted 'commanding the sea,' or by the mere titular and honorific 'having the dominion of the sea.' One editor of Herodotus, Ch. F. Baehr, did, however, see exactly what was meant, for, with reference to the allusion to Polycrates, he says, _classe_maximum_valuit_. This is perhaps as exact a definition of sea-power as could be given in a sentence.

[Footnote 13: Herodotus, iii. 122 in two places; v.83.]

It is, however, impossible to give a definition which would be at the same time succinct and satisfactory. To say that 'sea-power' means the sum-total of the various elements that go to make up the naval strength of a state would be in reality to beg the question. Mahan lays down the 'principal conditions affecting the sea-power of nations,' but he does not attempt to give a concise definition of it. Yet no one who has studied his works will find it difficult to understand what it indicates.

Our present task is to put readers in possession of the means of doing this. The best, indeed—as Mahan has made us see—the only effective way of attaining this object is to treat the matter historically. Whatever date we may agree to assign to the formation of the term itself, the idea—as we have seen—is as old as history. It is not intended to give a condensed history of sea-power, but rather an analysis of the idea and what it contains, illustrating this analysis with examples from history ancient and modern. It is important to know that it is not something which originated in the middle of the seventeenth century, and having seriously affected history in the eighteenth, ceased to have weight till Captain Mahan appeared to comment on it in the last decade of the nineteenth. With a few masterly touches Mahan, in his brief allusion to the second Punic war, has illustrated its importance in the struggle between Rome and Carthage. What has to be shown is that the principles which he has laid down in that case, and in cases much more modern, are true and have been true always and everywhere. Until this is perceived there is much history which cannot be understood, and yet it is essential to our welfare as a maritime people that we should understand it thoroughly. Our failure to understand it has more than once brought us, if not to the verge of destruction, at any rate within a short distance of serious disaster.